Quartz-mill.



PATENTED MAY 1U, 1904.

E. BOOKER. QUARTZ MILL. Pruonron FILED 11,411.16, nos.

2 SHEETS-SHEET 2.

v UNITED STATES Patented May 10, 1904.

PATENT OFFICE.

QUARTZ-MILL.

SPECIFICATION forming part of Letters Patent No. 759,497, dated May 10, 1904.

Application filed' March 16, i903.

To LLZZ 1071/0711/ it '11m/7J cori/cern:

i Be it known that I, EDWARD BooKER, a citizen of the United States,residing at San Diego, in the county of San Dieg'o and State of Gali- .fornia, have invented a new and useful Quartz- Mill, of which the following is aspeeilication. This invention relates to quartz-grmding mills; and it is an improvement on the device n for which application for Letters Patent of the United States, Serial No. 110,492, filed by myself on the 6th day'of June', 1902, is now pending. My present invention' has for its object to produce in a simple and compactt form a-mill or grinding device which shall be especially adapted tothe purpose of reducing' l to any desired degree of iineness ores, quartz,

and the like either for assaying or for comi mercial purposes, the main objects of my present invention being to provide a mill which shall' be very compact, easily dismembered, capable of adjustment forV the purpose of reducing the material subjected to its action to the desired degree of tineness, and in which the grinding' members have their operative surfaces so related that the iinal reduction shall member, thereby `not only supporting the weight ofthe latter and of the machine parts associated therewith,` but also reducing the friction caused by the upward strain upon said revoluble member when the latter is actively engaged in crushing the material fed into the mill. f Y f y With these and other objects in view, all of which tend to produce a machine of the class described which shall possess superior advantages in point of simplicity, durability, and general eiiiciency, my invention consists in the improved construction,arrangement, and combination of parts which will be hereinafter fully described, and particularly pointed out in the claims.

1n the accompanying drawings, Figure 1 is Serial No. 1428,072; (No model.)

a perspectiveviewof a quartz-mill'constructed in accordance with the principles of my inven` tion. Fig. 2 is a vertical sectional view ofthe same. Fig. 3 Vis a sectional detail View show# inga modification.

Corresponding parts in the several figures are 'indicated bysimilar numerals of reference. j l

rlhe base ofmy improvedquartz-mill may be described as consisting of a trough 1, preferably, although not necessarily, circulark in shape and provided with a circumferential rim or liange 2 having a suitably-disposed discharge-spout 3. Centrally upon said base and integral vtherewith is formed a projection 4, which is circular in cross-section and the diameter of which slightly decreases from its lower to its upper end. This part of the device may be termed a centering-plug, inasmuch as it serves to guide into position and to restrain from lateral movement the lower part of the stationary grinding member or pestle, as will be presently more fully de scribed. I desire here to state that the grind- 'ing members of my improved mill may be designated, respectively, as a pestle and a mortan which constitute,respectively, the inner statibnary and the outer revoluble grinding "membei". This designation, however, is naturally unimportant, and 1 merely desire to make the statement in order that no misunderstanding may arise as to the function of the parts.

The inner stationary grinding member or pestle is composed of two separate parts or membersY-a lower annular member 5, which may be described as a cylinder, the upper outer edge of which is beveled or inclined, so as to form a shoulder 6 and a liat top edge 7. The upperpart of the pestle comprises a cylindrical hollow casting 8, adapted to rest and to fit snugly upon the upper edge 7 of the member 5 and provided witha semisjraherical or dome-shaped top 9, which is of course integral therewith. While I describe this upper member of the pestle as consisting of a hollow casting, I desire it to'be understood that it is hollowed or cored simply for the purpose of avoiding excessive weight. Atthe sanie time it is absolutely necessary that it should IOO ' be massive and of great strength, and to make it solid would involve no departure lfrom `my invention. The lower part=5of the,pestleis provided with vertical perforations 10, alining with screw-threaded bores 11 in the lower edge of the part or casting 8. The base 1 is likewise provided with perforations 12, alining with the perforations 10 and bores 11, and in order to assemble the parts rods 13, screwthreaded at their upper and lower ends, are

passed upwardly through the perforations 12 of the base, through the perforations 10 of the lower part 5 of the pestle, and into the screwthreaded bores 11, which are engaged by the upper ends of said rods. The lower or outer ends of the latter are provided with nuts 14, p

by tightening which the partswviz., the base, they lower part 5, and upper part 8 of the gree of strength and rigidity. This is greatly assisted by the centering-plug 4, which fits ypestle-are secured together with a great desnugly within the lower part 5 ofthe pestle at the lower end of said plug, the latter serving to guide the part 5 into position, as will be means of bolts and nuts 20 and 21,the former of which .have tapered heads 22 counter-sunk in suitable recesses upon the inner or grinding surface of the mortar, so that whi-le the parts are firmly but detachably connected a Vperfectly-smooth inner grinding-surface will be produced. The lower edge 23 of the part 19 is beveled, as shown, to engage the beveled shoulder 6 at the upper edge of the lower ,part 5 of the pestle upon which it is seated in such a manner as to lit snugly around the exterior of the lower end of the c vlindrical body 8 of said pestle. From this connecting or converging point, which is designated 24, the bore or interior hollow part of the mortar 15 increases gradually in diameter toward its upper dome-shaped part, from whence the .diameter is again reduced slightly to the central or feed opening 25, which is disposed above and suitably spaced from the upper dome-shaped portion 9 of the pestle. The upper end of the part 16 of the mortar is projected upward to form a neck 26, surrounding the feed-opening, and this neck may be reduced in diameter and extended upwardly to form a feed-throat, as shown in Fig.'3 of the drawings; but by the preferred construction (illustrated in Fig. 2) I provide the neck 26 with an upwardly-extending tubular throat consisting ofa pipe 27 of suitable dimensions to withstand the wear and strain to which it will be subjected, said tubular extension being mounted securely in any preferred manner in the feed-opening 25 of the neck 26.

By the construction of the grinding members as herein described several advantages of real importance are gained, one of which is that the parts being separable the weight of each need lnotbe excessive, and the parts may therefore be conveniently disassembled for transportation. A more important advantage, however, resides in the fact that the parts which are exposed to the greatest wear-viz., the lower part 5 of the pestle and the lower part 17 of the mortar having the coacting surfaces 6 and 23when worn to such an extent as to be unserviceable may be easily replaced at a comparatively slight expense. Regarding this feature of my invention I desire to state that it is of course well understood that by making wearing-surfaces detachable they may be readily replaced at small expense, and I do not broadly claim the idea of providing detachable wear-plates or wearing-surfaces by my present invention. However, I have provided a novel and useful construction and arrangement of related parts which, asfar as I am aware, have not been heretofore known or used in the art.

Assuming the pestle and the mortar to have been placed in position upon the base in the related position indicated in Fig. 2, I place upon the shoulder 28 at the upper edge of the neck 26 an annular flanged ring 29, which may be constructed of sheet metal and which practically forms a cup-or shield within which are disposed a pair of bearing-rings 30, the opposing faces of which are provided with suitable ball-races, in which antifriction-balls 31 are placed.

The frame of the machine consists of a dome-shaped casting 32, having a plurality of legs 33, the lower ends of which are recessed ICG IIO

to form shoulders 34, that fit the upper edge of the flange 2 of the trough or base, with which the said frame is detachably connected by means of bolts and nuts 35 or other suitable means. The upper side of the frame 32 has an opening 36 of ample size to admit the mortar 15, which may be inserted or withdrawn through said opening, as occasion may demand. Suitably mounted upon the upper side or dome of the frame is a collar 37, adapted to lit nicely over said frame and provided with a screw-threaded opening 38. In this opening 38 is fitted a correspondingly-threaded sleeve 39, having a smooth bore which forms a bearingffor the throat 27 of the mortar. This sleeve 39 is in practice tted closely against the upper side of the upper bearing-ring 30. The upper end of the sleeve 39 has an unthreaded portion 40, which is engaged by a clamping-collar 41, the ends of which are firmly connected by means of a bolt 42 in such a manner as to grip the said sleeve so tightly as to prevent dislocation thereof under ordinary circumstances. I provide this clamping-collar with an arm 43 and a set-screw 44, adapted to engage recesses 45, formed for its reception in the upper side or dome of the frame.

Upon the throat 27, resting upon the upper edge of the sleeve 39, is placed an antifriction device comprising a pair of bearing-rings 46, the opposing faces of which are provided with ball-races, in which antifriction-balls 47 are placed. A flanged ring 48, of sheet metal or other suitable material, like the ring 29, is introduced between the lower bearing-ring 46 and the upper edge of the sleeve 39. These ianged rings or shields constitute casings inclosing the ball-bearings, so as to protect the latter from dust and from the admission into said bearings of fragments of rock, ore, and the like, which would have a very injurious effect upon their operation. By the simple device of these flanged ring's the ball-bearings are perfectly protected, the upper edges of the lianges of said rings extending upwardly, so as to lie practically in contact with the superimposed brace. Thus the fiange of the ring 29 will abut upon the under side of the collar 37, while the upper edge of the flange of the ring 48 will abut upon the under side of a worm-gear 49, which is fitted upon the throat 27 in such a manner as to be supported upon theupper bearing-ring 48 of the antifriction device, which may be said to support the weight of said gear, the latterbeing, however, firmly keyed to the throat 27, connected with the revoluble grinding member. In the upper end of the throat 27 is'L fitted a funnel or feed-hopper 50.

The frame 32 supports one or more brackets, as 5l, affording bearings for a shaft 52, having a worm 53 meshing with the gear 49. This shaft 52 is also provided with a fly-wheel 54 and with a pulley 55 to enable it to be belted to the source of power. I would, however, desire it to be understood that means for transmitting motion to the rotary grinding member of my improved quartz-mill may be varied to any extent within the scope of my invention. Thus I do not limit myself to the use ofthe Aworm and worm-gear, but reserve the right `to use any well-known means commonly used inthe arts for operating the device. I likewise desire it to be understood that the structural details-such as, for instance, the number of brackets for supporting the shaft 52 and other mechanical details# may be varied without departing from the spirit and scope of my invention.

Itwill be observed from the foregoing description that by the peculiar construction of the pestle and mortar herein described avery gradually contracted reduction space 56 is formed between the walls of said pestle and mortar. The consequence is that ores, quartz,

and the like subjected tothe action of myim-A proved mill will be reduced more gradually and evenly than would be possible in a mill where the grinding-spaee-is more abruptly contracted. It will also be understood that, as is the case in the application previously filed by myself and alluded to by number in the first part of this specification, thematerial fed into the mill will be disposed to rest upon the downwardly-inclined walls of the revoluble grinding member, and thereby carried around with the latter, being thusmorc readily subjected to the attrition of the stationary grinding member or pestle, as well as to mutual attrition of the fragments that are to be reduced, the latter being maintained in a state of more or less agitation, which materially assists in the comminution of the particles.

As regardstheoperation of the machine it is obvious that the weight of the revoluble grinding member and its related parts is normally supported upon the antifriction devices comprising the,t pairs of rings 30 and 46 and the interposed balls. By means of the clamping-collar 41, which may be manipulated by the arm 43, the screw-threaded sleeve 39 may Y be rotated in its bearings in the collar 37, thus raising or lowering the revoluble grinding member until it occupies the exact position with relation to the stationary grindingmember which is desired in order to accomplish 'the desired results. This adjustment, owing to the presence of the antifriction devices, may be effected much more readily and at less expenditure of power than'would be the case if said antifrietion devices were absent. A very important result attained by the hereindescribed arrangement of the antifriction devices is that they resist the rearward thrust of the revoluble grinding member when the machine is in operation, thus enabling the mill to be operated at a much less expenditure of power than has been possible in mills of this class as heretofore constructed.

The material fed into the mill is reduced as described bythe coaction of the stationary and the revoluble grinding members until it escapes between the coacting grinding-sur,- faces 6 and 23, the degree of lineness being of course capable of being' regulated by the vertical adjustment of the revoluble grinding member or mortar; When the latter is permitted to rest in direct contact with the beveled surface 6, the material issuing from the mill will be in the form of an impalpable powder.

I desire it to be understood that while I have in the foregoing described what I consider to be a simple and preferred form of my improved quartz-mill I do not necessarily limit myself to the structural details herein set forth, but reserve the right to any changes, modifications, and alterations which may be resorted to within the scope of my invention IOO IIO

and without departing from the spirit or sacrificing the utility of the same.

Having thus described my invention, I claiml. In a quartz-mill, a base having an upwardly-tapering centering-plug, an annulus engaging said plug and having a beveled portion at its outer upper edge, a cylindrical member supported upon the flat upper edge of the annulus and having screw-threaded bores, screw-threaded rods extending through the base and the annulus into said bores, and nuts upon the lower threaded ends of said rods.

2. In a quartz-mill, a supporting-base having a beveled centering-plug, a pestle constituting a stationary grinding member, said pestle being composed of two members, namely, a lower annular part engaging the centering-plug and having a iiat upper edge and an inclined portion extending beyond said fiat upper edge, and an upper cylindrical member having a dome-shaped top, said upper member being Supported upon the fiat upper edge of the lower member, the beveled edge of which constitutes a grinding-surface, and means connecting the said upper and lower members of the said stationary pestle with each other and with the base.

3. In a quartz-mill, a revoluble mortar constituting a grinding member, said mortar consisting of an ovoidal hollow casting, circular in horizontal section, shouldered at its lower end, and a correspondingly-shouldered annulus detachably connected therewith, said annulus being beveled upon its under side.

4. In a quartz-mill, a base, a stationary grinding member supported upon said base, a

dome-shaped frame having an opening in its upper side, a collar mounted upon said frame and having a screw-threaded opening alining with the opening in the frame, an exteriorlyscrew-threaded sleeve adjustable` in said collar, and arevoluble grinding member having a cylindrical throat journaled in said sleeve.

5. In a quartz-mill, the combination with a frame having an opening, of an internallyscrew-threaded collar associated therewith in registry with said opening, an externallyscrew-threaded sleeve adjustable in said collar, and a revoluble grinding member journaled in said sleeve, said revoluble grinding member being of less exterior diameter than the interior diameter of the opening in the frame.

6. In a quartz-mill, the combination of a base, aframe having an opening in its upper side, an externally-screw-threaded collar connected detachably with said frame in registry with the opening therein, an externally-screwthreaded sleeve adjustable in said collar, a revoluble grinding member journaled in said sleeve, said revoluble grinding member being of less external diameter than the internal diameter of the opening in the frame which is in registry with the internal-screw-threaded co1- lar, and means for eiecting the adjustment of said revoluble grinding member with relation to the supporting member. p

7. In a quartz-mill, the combination of a base, a stationary grinding member, a frame connected with the base, a collar detachably associated with said frame and having internal screw-threads, an extern ally screw-threaded sleeve engaging said collar, a revoluble grinding member having a feed-opening and an annular neck surrounding the same` a cylindrical feed-throat associated with and extending upwardly from said neck, a driven gear mounted upon said cylindrical Jfeed- 4throat, antifriction-bearings interposed between the lower end or' the adjustable sleeve and the upper edge of the neck of the revoluble grinding member and between the upper edge of said sleeve and the under side of the driven gear, and rings interposed between said antii'riction devices and the members'supporting the same, said rings having upwardly-extending flanges abutting upon the superimposed members and forming shields for the said antifriction devices. Y

8. In a quartz-mill, the combination of a stationary grinding member, a' revoluble grinding member housing said stationary grinding member and having a cylindrical throat, a vertically-adjustable sleeve forming abearing for said throat, a driven gear mounted upon said throat above said sleeve, and antifriction devices interposed between the upper and lower ends of said sleeve andthe driven gear and the body of the revoluble grinding member, respectively.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses. l

EDWARD BOOKER. Witnesses:

JAMES M. STEADE,

M. ALTAMIRANO.

IOO 

